This page explains how Santiago Echeverri (USATT# 222345)'s rating went from 1263 to 1236 at the Westchester September 2019 Open held on 28 Sep 2019 - 29 Sep 2019. The links below take you to pages that describe various aspects of the rating processor.

The rating processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.